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Finding the Fourth Proportional to 87.93, 132.46 and 72.09

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Solution

The fourth proportional to 87.93, 132.46 and 72.09 is: 108.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.93 : 132.46 = 72.09 : x
  2. Step 2: Convert to fraction form
    87.93/132.46 = 72.09/x
  3. Step 3: Cross multiply
    87.93x = 132.46 × 72.09
  4. Step 4: Simplify right side
    87.93x = 9,548.86
  5. Step 5: Solve for x
    x = 9,548.86/87.93
  6. Step 6: Final answer
    x = 108.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.